General information

100% Free (*see details below...)

The triangle solver for geometry students, teachers, carpenters, construction projects, navigation, orienteers, surveyors, astronomers,... or anyone wanting to solve triangles.

The only triangle solver that draws the values you enter and enters the values you draw.

Enter anything you know and the app tells you everything that can be calculated. If a value is possible to solve, the app solves it immediately. If a value is impossible to solve, the app lets you know.

Calculates sides, angles, heights, perimeter, area, vertex positions and multiple centers. Allows you to enter heights, perimeter, area, vertex positions and centers, not just sides and angles like other triangle solvers.

No need to press an enter key to solve your triangle. Just draw or enter and immediately visualize the solution.

Easily clear and restore individual values by touching the value's icon. Press and hold icons for quick right triangle entry and math expressions (e.g. 9+7/32).

Solves triangles using xy, or rθ coordinate systems, including any combination of each to suit your situation.

Categorize scalene, isosceles and equilateral as well as acute, right, and obtuse triangles. Identifies and solves ambiguous triangles.

Angle units in degrees, radians, grads, deg min sec, % grades, and much more. Length units are universal and metric/imperial convertible. Unit conversions are automatic and without reentry.

Transformations include translate, rotate, reflect and dilate. Transformations are coordinate system aware to facilitate easy understanding by beginning students while providing maximum flexibility for advanced users.

Results are calculated using numerically stable trigonometric algorithms giving the most precise results possible even in extreme engineering applications. Unlike many triangle solvers that give wrong answers, extreme cases are handled with precision.

All values can be either user entered or app calculated in any combination. For example, enter the triangle's base and height and area is calculated. Enter the triangle's area and height and the base is calculated. Enter any value in any order and the correct formula is applied. No other app calculates inverse and partial solutions automatically.

Calculable values are shown with easily identifiable color icons while user entered values are indicated by sharp contrast icons suitable for color blind users.

Both inputs and outputs can be modified to allow for exploration and experimentation.

Field sizes are dynamically adjusted so extreme precision values fit on the smallest phone screens.

You have found the best triangle solver, no risk to try, guaranteed.

I appreciate your constructive feedback.

* Free Offer:

Contact me by email and request a free promotion code for a fully functional download, no ads, no upsells, no in-app purchases, no strings, ... just free.

Developer's email: bessermt@gmail.com

In memory of my geometry teacher Mr. Robert Wegner.